Composition of matter for tempering steel.



EDWIN ARCHER HALSETI-I, OF CLEARBROOK, MINNESOTA, ASSIGNOR OF ONE-HALF TO EDI) BOE, F CLEARBROOK, MINNESOTA.

v COMPOSITION OF MATTER-FOR TEMPERING STEEL.

Ito Drawing.

To all whom it may concern: 7

Be it known that I, EDWIN ARCHER HAL- SETH, a citizen of the United States, residing at Clearbrook, in the county of Clearwater and State of Minnesota, have invented a new and Improved Composition of Matter for Tempering Steel, of which the following is a full, clear, and exact description.

My invention relates to a composition of matter for tempering steel. The object of the invention is to provide a composition 7 whereby steel can be hardened without danger of cracking the steel or warping the article in 'temperlng.

The composition consists of following ingredients and in substantially the following proportions: V

Alum, 3 pounds; ammonium chlorid, 2? pound; vinegar, gallon (or its equivalent of acetic acid); oil, gallon; lemon juice from about dozen lemons (or its equivalent of citric acid.)

This is mixed with five gallons of Water,

and the mixture is ready for tempering.

I preferably use a lubricatin oil known in the trade as tropical oil and having the following characteristics Gravity 26 Viscosity 225 to 230 Flash 37 5 Fire 425 V Coat test Color #3 Specification of Letters Patent.

but it is to be understood that I am not re- PatentedMar. 11, 1919. 7 Application filed July 24 1918. Serial No. 246,543.

may be increased to three quarts and the quantity of oil decreased to one quart.

The ingredients above given are mixed in the following way:

The alum and annnoniuln chlorid are mixed with the vinegar, then the oil is added to the above mixture while the same is Well stirred. This mixture is then poured into" five gallons of Water. The solution 1s then ready'for tempering steel in the well known :Having thus described my invention, I

claim as new and desire to secure by Letters Patent:

A tempering mixture comprising alum,

EDWIN ARCHER HALSETH.

Gopies of this patent may be obtained for five cents each, byaddressing the Gommissioner of Patents,

' Washington, D. G."

proportions substantially as 

